ALTHOUGH SOME web sites reported that the upcoming R580 chip will come in three different versions, the fact is that R580 chip will replace the R520 line entirely. The new products will be named Radeon X1900XL, X1900XT and X1900XT CrossFire Edition. There is a rumour of another naming convention, with the names X1900XT ("T" instead of an "L"), X1900XTX (The Boss, King, Macho) and X1900XTX CrossFire Edition (albeit a little slower clocked than a big boss).